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Use of bandwidth efficient modulation techniques in a wavelength division multiplexed optical link

  • US 6,407,837 B1
  • Filed: 11/25/1998
  • Issued: 06/18/2002
  • Est. Priority Date: 11/25/1998
  • Status: Expired due to Term
First Claim
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1. A data transmission system, comprising:

  • first and second bandwidth efficient modulation modulators for encoding data for transmission using a microwave carrier signal to produce first and second carrier signals having a first carrier frequency;

    a downconverter for downconverting the carrier signal output by the first wavelength division multiplexed modulator to a lower carrier frequency;

    a combiner for combining the downconverted and second carrier signals to provide a composite microwave signal;

    a wavelength division multiplexed transmitter for transmitting the composite microwave signal on one wavelength division multiplexed channel over an optical fiber;

    a wavelength division multiplexed receiver coupled to the optical fiber for reproducing the composite microwave signal transmitted over the optical fiber;

    a splitter and filters for separating out the downconverted and second carrier signals from the composite microwave signal;

    an upconverter for upconverting the downconverted carrier signal to the first carrier frequency; and

    first and second demodulators for demodulating the upconverted and second carrier signals to generate the originally transmitted data.

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